摘要
设X是一个紧致连通的ANR’s,f:X→X是连续映射.于是f有Nielsen型数NF_n(f),它是数集的下界,本文在X是环时,给出NF_n(f)是该数集的下确界,即存在连续映射,使得#Fix(g ̄n)=NF_n(f).的一个充分条件.
Let X be a compact path-connected ANR’s and f:X-X be a map. The Nielsen type number NF_n(f)has been defined,and the inequality holds. In this paper we prove that if X is a torus,then under some condition the equality holds,i.e. there is a map g f such that
出处
《数学进展》
CSCD
北大核心
1995年第2期155-160,共6页
Advances in Mathematics(China)